After 13 days, the plume of dust passed back over the Taklamakan desert, having completed a full circuit of the globe.
13天后，这股空中的沙球回到了塔克拉玛干沙漠，完成了整个环游世界一圈。
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The circuit is more known for its varied terrain than its difficulty, and while some days can be a challenge, each day can be completed by mid-afternoon.
Or you could sit at a bench with other technicians placing completed cell-phone circuit boards into lead-lined boxes resembling small kilns, testing each piece for electromagnetic interference.